1 // SPDX-License-Identifier: BSD-2-Clause
2 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 *
4 * LibTomCrypt is a library that provides various cryptographic
5 * algorithms in a highly modular and flexible manner.
6 *
7 * The library is free for all purposes without any express
8 * guarantee it works.
9 */
10 #include "tomcrypt_private.h"
11
12 /**
13 @file f9_init.c
14 F9 Support, start an F9 state
15 */
16
17 #ifdef LTC_F9_MODE
18
19 /** Initialize F9-MAC state
20 @param f9 [out] f9 state to initialize
21 @param cipher Index of cipher to use
22 @param key [in] Secret key
23 @param keylen Length of secret key in octets
24 Return CRYPT_OK on success
25 */
f9_init(f9_state * f9,int cipher,const unsigned char * key,unsigned long keylen)26 int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen)
27 {
28 int x, err;
29
30 LTC_ARGCHK(f9 != NULL);
31 LTC_ARGCHK(key != NULL);
32
33 /* schedule the key */
34 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
35 return err;
36 }
37
38 #ifdef LTC_FAST
39 if (cipher_descriptor[cipher]->block_length % sizeof(LTC_FAST_TYPE)) {
40 return CRYPT_INVALID_ARG;
41 }
42 #endif
43
44 if ((err = cipher_descriptor[cipher]->setup(key, keylen, 0, &f9->key)) != CRYPT_OK) {
45 goto done;
46 }
47
48 /* make the second key */
49 for (x = 0; (unsigned)x < keylen; x++) {
50 f9->akey[x] = key[x] ^ 0xAA;
51 }
52
53 /* setup struct */
54 zeromem(f9->IV, cipher_descriptor[cipher]->block_length);
55 zeromem(f9->ACC, cipher_descriptor[cipher]->block_length);
56 f9->blocksize = cipher_descriptor[cipher]->block_length;
57 f9->cipher = cipher;
58 f9->buflen = 0;
59 f9->keylen = keylen;
60 done:
61 return err;
62 }
63
64 #endif
65
66 /* ref: $Format:%D$ */
67 /* git commit: $Format:%H$ */
68 /* commit time: $Format:%ai$ */
69
70